Table III.

Outcomes for each cohort following total knee arthroplasty (TKA)

Outcome	15 mg/kg (n = 1531)	30 mg/kg (n = 1006)	RR (95% CI)	p-value
Transfusion, n (%)	64 (4.2)	27 (2.7)	0.64 (0.41 to 0.99)	0.049*
Post-operative Hb (g/dL), mean (range)	11.69 (7.1 to 16.1)	12.01 (7.8 to 16.2)	Difference 0.32 (0.20 to 0.42)	< 0.001†
LOS (mean days), n (range)	4.6 (0 to 81)	3.6 (0 to 61)	-	< 0.001‡
Re-admission 30 days, n (%)	109 (7.1)	40 (4.0)	0.56 (0.39 to 0.80)	0.001*
RTT 30 days, n (%)	13 (0.8)	5 (0.5)	0.59 (0.21 to 1.64)	0.344*
Aspiration	2 (15.4)	0 (0.0)	-	-
Wound debridement	11 (84.6)	5 (100)	-	-
Critical care admission, n (%)	36 (2.4)	8 (0.8)	0.34 (0.16 to 0.72)	0.003*

^*chi-squared

^†Unpaired t-test

^‡Mann-Whitney U test

Bold values are statistically significant

Hb, haemoglobin; RR, risk ratio; CI, confidence interval; LOS, length of stay; RTT, return to theatre